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Research on modeling of cascaded hybrid modular inverters has concentrated on conventional H-bridge topologies. In addition, research on hybrid H-bridge that gives a five-level output voltage is well documented, but a detailed analysis on how this model can be cascaded has not been researched on. This paper presents a detailed modeling analysis of a cascaded hybrid modular inverter topology. First a PWM control law is derived and used in developing a novel switching model. Derived state space equations are used in a developing generalized N-cascaded hybrid model. Simplified average models both in abc to dqo are proposed and described. Finally, small signal model computed in dq synchronous frame is developed. Feedback controller design is presented with main focus on grid voltage regulation and overall system capacitor voltage balance. A modular balance circuit is proposed for individual cell capacitor voltage. Both the MATLAB simulation and laboratory results show good performance of the proposed PWM control scheme and the accuracy of the hybrid model.

Modeling, Control and Experimental Investigation of a Cascaded Hybrid Modular Inverter for Grid Interface Application